Galaxy S5 Storage full -10000 MB?? Help me.

Today, I decided to unroot and factory reset my phone. When it booted up again, I noticed that I can't take any pictures or download music. I couldn't even take screenshots of the warning message so I had to do it with my dad's phone.

The phone says I have no storage space when I obviously do. How do I fix this?

I've tired googling this problem but I couldn't find much.

sorry for the big images...